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i UNITED STATES IPATl-:iwrOFFICE.

AD'IN w. MITOHEIILOF DIALTON, oHIo.

LETREE.

SPECIFICATION forming part'of Letters Patent N0. 522,611, dated July 10,1894. Application filed October 30,1893. Serial No. 489,435. (No model.)

To all whom vit may ccm/cern.:

\ Be it known thatfI, ADIN' W. MITCHELL, a citizen of the United States, residing at Dialton,in the county of Clark and State of Ohio, yhave inventedv certain new and useful Improvements in Double and Single'lre'e Attach, ments, of which the following is a specification, reference being had therein to the accompanying drawings. f

This invention relates tocertain new and useful improvements in double and single tree attachments, and the object of my invention is to make a strong and perfectly se` cure pivotal connection between them and their supporting bar and at the same time prevent all noise due to rattling and to provide for taking up the lost motion resulting from wear.

With these objects in view my invention consists of the peculiarities hereinafter fully described and particularly pointed out in the claims.

lIn the accompanying drawings on which like reference letters indicate corresponding parts: Figure l, represents a plan view of a pair of shafts with my improvements applied thereto; Fig. 2, a rear view of a single-tree and cross bar in connection with my invention; Fig. 3, a transverse vertical section taken through the joint;- and Fig. Il, la detail view showing two constructions for, preventingthe post-cap from turning.

I have shown my invention as applied to a single-tree on the bar of a pair of shafts and will so describe it; but it is obvious and will accordingly be understood that it may be applied to the connection of single-trees and double-trees to the pole or houndsof vehicles.

The letter A designates the cross bar of a pair of shafts and the letter C a clamp or jaw constructed of metal, say malleable iron or cast steel. It has threev sides and embraces the bar. A screw D secures the rear side and a screw F the lower side. forms a plate upon which the single-tree iron turns. From this plate projects a post H, having a shoulder J near the base. The post is bored vertically and the hole is screwthreaded. In Vone form the post is shown provided with a groove J and in another with a flattened part K. The object of these The upper side G- constructions is to prevent the post-cap L from turning@ This cap is shown at L and has a bead M to fit the groove J or a iat place O to fit t-he dat placeK of the post. It ts down over the post and upon the upper plate of the single-tree iron. It is recessed at the upper end to receive the screw Q which enters the threaded opening in the post.

The letter R designates a single-tree iron which consists of a clamp or jaw adapted to embrace three sides, namely the back, the top and the bottom of the single-tree. The back piece is lengthened out to form a brace to increase the strength of the single-tree 'and \is fastened by screws or rivets. The bottom plate is bored out to t the shoulder of the post and the single-tree is bored to fit the post itself. The upper plate of the iron Ris preferably slightly` recessed toy receive the lower end of the post cap L When the parts are put together, as shown in the sectional View and the screw is screwed down into the post it enters thecountersunk upperend of the. cap and forces the cap down until the single-tree iron and'crossbar iron are in close contact, tight enough to prevent rattling and yet loose enough to allow slight motion. As the parts Wear the screw is screwed farther down. As the screw enters the countersink in the cap the hair of the horses tail cannot get caught on the screw-head. Y

It will be seen that as the post-cap is engaged by the post to prevent turning on the post the motions of the singletree, dueto the action produced by the horses shoulders, does not and cannot turnY the cap and hence cannot loosen any screw device. In the use of nuts in the ordinary way trouble constantly arises in the nut being unscrewed by the action of the single-tree when the post is carried by the cross-bar or by the action of the post when it is carried by the singletree. When the nut is screwed tight enough to prevent coming off, the single-tree will not move to accommodate the horses shoulders. If it is not screwed tight enough, the parts will rattle and the nut will lose od. With my construction the cap has no movement independent of the screw; the screw and the cap have a fixed relation and the cap is held from being turned on the post.

Having thus fully described my invention,

IOO

what I claim as new, and desire to secure by Letters Patent, is

1. The combination with a single or doubletree, and its supporting bar, of a. post carried 5 by one member and pivotally supporting the other, a removable cap fitted to one end of the post so as to be adjustable lengthwise thereon, and-engaging with the post so as to be non-rotatable, and a screw device engagro ing with the cap to adjust it down and hold it. 2. The combination with a single or double tree and its supporting bar, of a clamp or jaw carrying a post and secured to said bar, a

ADIN W. MITCHELL.

Witnesses:

OLIVER H. MILLER, W. M. MCNAIR. 

